Kendra’s so mad that she’s threatening to go to another wedding instead of Hugh’s!

Kendra Wilkinson is mad about Hugh! She’s says she insulted that she hasn’t received a save-the-date card for the June 18 wedding of her ex-boyfriend Playboy head-honcho Hugh Hefner, 84, and Crystal Harris, 24.

Kendra has another wedding she can attend June 18 — and she has to choose between Hugh’s ceremony or her close girlfriend’s.

“I’m getting kind of antsy because I need to pick which wedding to go to,” Kendra says.

But Kendra, 25, doesn’t necessarily blame Hugh. “It’s Crystal that does the wedding planning. She’s the girl,” says Kendra. “If she doesn’t give me a save the date soon, I’m going to have to put in my save the date with the other wedding.”